Robust Digital Image Watermark Based on DWT

A new robust digital image blind watermark scheme is proposed.This scheme uses (extension) and scrambling technique to generate watermark from copyright message binary image.Then the(original) image is decomposed by MRA,and watermark is embedded into middle frequency at LH and HL sub-bands.The watermark extraction process adopts independent component analysis and includes (de-scrambling) and de-extension.The difference between this scheme and others is that especial extension method is presented,thus the robustness of this scheme is improved greatly.The experimental results show that this scheme is robust against various attacks of Checkmark benchmarking software.